I'd say a lot has to do with cyclist behavior. Hugging the curb does not help, it invites motorists to pass even when it is not safe to do so. It is much safer

I'd say a lot has to do with cyclist behavior. Hugging the curb does not help, it invites motorists to pass even when it is not safe to do so. It is much safer to take the lane, occupy the middle of it, so other vehicles coming from behind know that they either have to wait or change lanes to pass. Segregating cyclists into cyclists-only lanes do not help either. As they usually force them to ride as if they where hugging the curb or in any case give the impression that it is not safe to take the lane. Plus of course all other problems caused at intersections.